Clinical data
ATC code
  • none
Legal status
Legal status
  • 2-methyl-3-phenylbutan-2-amine
CAS Number
PubChem CID
ECHA InfoCard100.006.458 Edit this at Wikidata
Chemical and physical data
Molar mass163.264 g·mol−1
3D model (JSmol)
  • CC(C1=CC=CC=C1)C(C)(C)N
  • InChI=1S/C11H17N/c1-9(11(2,3)12)10-7-5-4-6-8-10/h4-9H,12H2,1-3H3 ☒N
 ☒NcheckY (what is this?)  (verify)

Pentorex (Modatrop), also known as phenpentermine or α,β-dimethylamphetamine, is a stimulant drug related to phentermine which is used as an anorectic to assist with weight loss.[1][2] It also acts as a diuretic.[3] Pentorex was developed by Nordmark in the 1960s.[4]


  1. ^ Behrendt WA, Deininger R (August 1963). "On the Pharmacology of 2-Phenyl-3-Methyl-3-Butylamine, A Substance with Anorexic Action". Arzneimittel-Forschung (in German). 13 (8): 711–6. PMID 14090434.
  2. ^ Opitz K, Kemper F, Loeser A (March 1965). "[Comparative study of the anorexigenic potency of some appetite depressants]". Arzneimittel-Forschung (in German). 15 (3): 278–81. PMID 5897218.
  3. ^ Opitz K (February 1965). "Natriuretisch-diuretische Wirkung von appetithemmenden Amphetamin-Derivaten". Klinische Wochenschrift (in German). 43 (4): 225–7. doi:10.1007/BF02350860. PMID 14265209. S2CID 46237660.
  4. ^ GB patent 995063, "A Substituted Butylamine and Salts thereof", issued 1965-06-10, assigned to Nordmark